13.3 years of HDTV content. That's approximately 58,292 movies, which means an equal number of large pizzas. So one petabyte equals 52 tonnes of pepperoni pizza. Yes, my head has assploded. For other equivalents, click and zoom in.

How big are 20 million four-drawer cabinets? As big as the Sears Tower? I have a hard time visualizing that. Strangely enough, I don't have any problem visualizing 52 tonnes of pepperoni pizza. [Mozy]